Screw fastener and driving tool

In combination, a screw fastener and a driving tool for turning said screw fastener in a workpiece hole, wherein said screw fastener has a central axis and comprises:

• an elongated shank, a threaded section on one end of said shank, and a head on an opposite end of said shank, wherein said head has a driving end face, and a polygonal driving socket extending inwardly into said head from said driving end face, wherein said polygonal driving socket is centered about said central axis and comprises a first section having a plurality of inwardly extending first flat side walls terminating at a first flat bottom wall, a second section having a plurality of slots, wherein each of said slots has a plurality of inwardly extending second flat side walls which terminate at a second flat bottom wall, wherein said first and second flat bottom walls are coplanar and form a common flat bottom surface for said polygonal driving socket, and wherein each of said slots intersects with a respective one of said first flat side walls and opens into said first section, and each of said slots radiates outwardly from the center of each of said first flat side walls, respectively;
• wherein said driving tool comprises:
• an elongate polygonal shank having a plurality of third flat side walls and an end face at one end thereof;
• and
• a driving section on said one end of said polygonal shank, wherein said driving section includes a drive fin integral with and extending radially outwardly from the center of each of said third flat side walls, each of said drive fins extending longitudinally inwardly from said end face along a respective third flat side wall for a length at least equal to a depth of each of said screw fastener driving socket slots, said driving section further including a portion of said polygonal shank adjacent to said drive fins, said drive fins and said adjacent polygonal shank portion being complementary in shape to, and dimensioned to be snugly received in, said polygonal driving socket to effect turning of said screw fastener
• wherein said driving tool further comprises a handle mounted on an opposite end of said polygonal shank for manually turning said driving tool;
• wherein said screw fastener further comprises first lubricant conveying means extending axially through said elongate shank;
• and
• wherein said driving tool further comprises second lubricant conveying means for delivering lubricant from said driving tool, through said first lubricant conveying means of said screw fastener and into said workpiece hole.